Why do I need power management if I have a great power cord?

U think you are right...

By definition electronic engineering is about trade-off craftmanship...

In some case a conditioner is postive addition in some other case negative... And with the same gear it can also change in time if we change other factors in mechanical, electrical and acoustical working dimensions...

I have yet to hear a conditioner that didnt take away as much as it gave. Far better to start with dedicated lines properly done and then experiment.

@rtorchia

Your system? It would be good if put photos of your system on line under your user ID. Your experience? What components and power components have you tested?

Other contributors to this forum also seem to assume that the capacitor banks are there to help the amplifier deliver transients to the speakers outside the range of their normal current demands. 

1. Capacitors are the are the only source of power to the speaker. It is not the power cable coming in. It is the capacitors via the tube or FET or whatever output valve that draws from the well which is the capacitor.
2. There are no transcients outside of the normal current demands. All are inside “normality”… if the amp is not clipping.
3. A speaker is not a shorted amp… that is what he did there.
   1. If fact shorting an amp will often fry an amp,

I bought a PS Audio Stellar mainly to protect my 50k+ electronics from damage. But i heard zero difference in sound quality. We must hear out all the expert opinions but be guided by our own experience. I think my system sounds amazing, with or without the PSA unit. I dont mind a $2500 outlay for the protection it provides. But we should all get off this crazy wagon and just buy records to support our favorite artists. 

I must be really really stupid not to understand much of these past several posts. I would hope the people commenting in such a technically proficient way would recognize that most readers have no clue what they’re saying.

They don't either.